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ABB | SACE Tmax XT

ROCOF Protection Protection Trip threshold
[ANSI code] Trip time t t tolerance (3) Trip time tolerance
ROCOF [81R] t = t28 ± 10 % (6) the best between ± 20% and 200 ms
t

Motor protections Protection Trip threshold
[ANSI code] Trip time t t tolerance (3) Trip time tolerance
R JAM [51LR] t = tj ± 10 % with If ≤ 6 In: ± 7 % / with If > 6 In: ± 10 %
t
R STALL [51LR] t = ts ± 10 % ± 10 %
t
UC [37] t = tuc ± 15 % ± 20 %
t
U t = tu (8) ± 15 % ± 20 %
t

Note on protections (1) use trip and threshold current values expressed in In for calculating t (example: If = 0.8 In, I1= 0.6
t
In)
(2) with t4 = instantaneous, the maximum tolerance is 50 ms
(3) Tolerance values valid with Trip unit at steady state or on with auxiliary power supply, trip time ≥
100 ms, temperature and signals within operating limits; the tolerances in the table after the notes
are applicable if the conditions are not guaranteed
(4) the trip unit considers 3% hysteresis for quitting alarm condition
(5) tolerance valid for frequencies within range: fn ± 2 %. A ± 5% tolerance is applicable for off range
frequencies
(6) ± 20% for threshold 0.4 Hz / s
(7) time to be considered valid after Motor start-up
(8) time to be considered valid with protection in alarm status after Motor start-up; if the alarm
appears during Motor start-up, the trip unit calculates and uses the lowest value between tu and the
half of Motor start-up
(10) with If ≥ 18 kA, t ≤ 3 ms;
t
with If < 18 kA and If ≥ I31 * 3, t ≤ 7 ms (If three-phase) or t ≤ 9 ms (If single-phase);
t
t
with If < 18 kA and If < I31 * 3, t ≤ 15 ms.
t
(operating parameters guaranteed with Vaux auxiliary power supply)
(11) tolerance valid with threshold U14 > 10%; with U14 ≤ 10% (and >6%), the tolerance is 10%; with
U14 < 5%, the tolerance is 15%
Performance guaranteed in all operating conditions
Protection Trip threshold tolerance Trip time tolerance
Activation within range: (1.05 to 1.2)
L ± 20 %
x I1
S ± 10 % ± 20 %
I / 2I ± 15 % ≤ 60 ms
± 20 % (60 ms with t4 =
G ± 15 %
instantaneous)
UF / UF2 / OF / ± 2 % ± 20 %
OF2
± 20 %; in the case of single-phase
RV ± 10 % self-supply: the highest between ± 20
% and 30 ms
Other -- ± 20 %

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